Mitsubishi Electric A173UHCPU User Manual page 126

5. INSPECTION AND MAINTENANCE
Output load does not turn on
Is the
indicator LED of the output
module ON?
Is voltage
applied from load power
supply?
What is
voltage across the output
module output COM
terminals?
Defective output module.
Replace output module.
Check max. rush current
when loads simultaneously
turned on.
End
(7) Flowchart when output module load does not turn on
Follow the flowchart below if the output module loads do not turn on during
operation.
NO Check output mode in monitor
mode from peripheral device.
YES
NO
Check if input signal is OFF in
YES
monitor mode from peripheral
device.
Check load power supply
wiring. Reset power supply.
0V Check load wiring and load.
Reset.
Supply voltage value is provided.
Change relay numbers. Keep
NG
current within max. current
for simultaneous loads on.
OK
POINT
If the input signal or load does not turn off, refer to Section 5.4.1 (9) "Possible
Problems with I/O Modules."
Is the
indicator LED of the input
module ON?
YES
5 − 15
Measure voltage between
NO
module input and COM
terminals.
(Monitored
signal OFF)
Check external
wiring and external
equipment.
Contact your nearest
Mitsubishi representative with
details.
0V
Supply
voltage